// DefaultHandler2.java - extended DefaultHandler
// http://www.saxproject.org
// Public Domain: no warranty.
// $Id: DefaultHandler2.java,v 1.3 2002/01/12 19:04:19 dbrownell Exp $
package org.xml.sax.ext;
import java.io.IOException;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
* This class extends the SAX2 base handler class to support the
* SAX2 {@link LexicalHandler}, {@link DeclHandler}, and
* {@link EntityResolver2} extensions. Except for overriding the
* original SAX1 {@link DefaultHandler#resolveEntity resolveEntity()}
* method the added handler methods just return. Subclassers may
* override everything on a method-by-method basis.
*
* <blockquote>
* <em>This module, both source code and documentation, is in the
* Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
* </blockquote>
*
* <p> <em>Note:</em> this class might yet learn that the
* <em>ContentHandler.setDocumentLocator()</em> call might be passed a
* {@link Locator2} object, and that the
* <em>ContentHandler.startElement()</em> call might be passed a
* {@link Attributes2} object.
*
* @since SAX 2.0 (extensions 1.1 alpha)
* @author David Brownell
* @version TBS
*/
public class DefaultHandler2 extends DefaultHandler
implements LexicalHandler, DeclHandler, EntityResolver2
{
/** Constructs a handler which ignores all parsing events. */
public DefaultHandler2 () { }
// SAX2 ext-1.0 LexicalHandler
public void startCDATA ()
throws SAXException
{}
public void endCDATA ()
throws SAXException
{}
public void startDTD (String name, String publicId, String systemId)
throws SAXException
{}
public void endDTD ()
throws SAXException
{}
public void startEntity (String name)
throws SAXException
{}
public void endEntity (String name)
throws SAXException
{}
public void comment (char ch [], int start, int length)
throws SAXException
{ }
// SAX2 ext-1.0 DeclHandler
public void attributeDecl (String eName, String aName,
String type, String mode, String value)
throws SAXException
{}
public void elementDecl (String name, String model)
throws SAXException
{}
public void externalEntityDecl (String name,
String publicId, String systemId)
throws SAXException
{}
public void internalEntityDecl (String name, String value)
throws SAXException
{}
// SAX2 ext-1.1 EntityResolver2
/**
* Tells the parser that if no external subset has been declared
* in the document text, none should be used.
*
* @param name Identifies the document root element. This name comes
* from a DOCTYPE declaration (where available) or from the actual
* root element. The parameter is ignored.
* @param baseURI The document's base URI, serving as an additional
* hint for selecting the external subset. This is always an absolute
* URI, unless it is null because the XMLReader was given an InputSource
* without one. The parameter is ignored.
*
* @return null (always).
*
* @exception SAXException Any SAX exception, possibly wrapping
* another exception.
* @exception IOException Probably indicating a failure to create
* a new InputStream or Reader, or an illegal URL.
*/
public InputSource getExternalSubset (String name, String baseURI)
throws SAXException, IOException
{ return null; }
/**
* Tells the parser to resolve the systemId against the baseURI
* and read the entity text from that resulting absolute URI.
* Note that because the older
* {@link DefaultHandler#resolveEntity DefaultHandler.resolveEntity()},
* method is overridden to call this one, this method may sometimes
* be invoked with null <em>name</em> and <em>baseURI</em>, and
* with the <em>systemId</em> already absolutized.
*
* @param name Identifies the external entity being resolved.
* Either "[dtd]" for the external subset, or a name starting
* with "%" to indicate a parameter entity, or else the name of
* a general entity. This is never null when invoked by a SAX2
* parser.
* @param publicId The public identifier of the external entity being
* referenced (normalized as required by the XML specification), or
* null if none was supplied.
* @param baseURI The URI with respect to which relative systemIDs
* are interpreted. This is always an absolute URI, unless it is
* null (likely because the XMLReader was given an InputSource without
* one). This URI is defined by the XML specification to be the one
* associated with the "<" starting the relevant declaration.
* @param systemId The system identifier of the external entity
* being referenced; either a relative or absolute URI.
* This is never null when invoked by a SAX2 parser; only declared
* entities, and any external subset, are resolved by such parsers.
*
* @return An InputSource object describing the new input source.
*
* @exception SAXException Any SAX exception, possibly wrapping
* another exception.
* @exception IOException Probably indicating a failure to create
* a new InputStream or Reader, or an illegal URL.
*/
public InputSource resolveEntity (String name, String publicId,
String baseURI, String systemId)
throws SAXException, IOException
{ return null; }
// SAX1 EntityResolver
/**
* Invokes
* {@link EntityResolver2#resolveEntity EntityResolver2.resolveEntity()}
* with null entity name and base URI.
* You only need to override that method to use this class.
*
* @param publicId The public identifier of the external entity being
* referenced (normalized as required by the XML specification), or
* null if none was supplied.
* @param systemId The system identifier of the external entity
* being referenced; either a relative or absolute URI.
* This is never null when invoked by a SAX2 parser; only declared
* entities, and any external subset, are resolved by such parsers.
*
* @return An InputSource object describing the new input source.
*
* @exception SAXException Any SAX exception, possibly wrapping
* another exception.
* @exception IOException Probably indicating a failure to create
* a new InputStream or Reader, or an illegal URL.
*/
public InputSource resolveEntity (String publicId, String systemId)
throws SAXException, IOException
{ return resolveEntity (null, publicId, null, systemId); }
}